Physics
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..apr..m801n&link_type=abstract
American Physical Society, APS/AAPT Joint April Meeting, April 18-21, 1998 Columbus, Ohio, abstract #M8.01
Physics
Scientific paper
The Rossi X-ray Timing Exlporer (RXTE) was launched a little over two years ago with the expectation that it would search for signatures coming from the very innermost regions of black hole and neutron star systems. In this endeavor it has succeeded spectacularly. Over the past two years, RXTE has accumulated a wealth of information about black hole candidates (BHC) within our own galaxy. Of these systems, two stand out for having exhibited high frequency, nearly periodic oscillations. The `microquasars' GRS 1915+105 and GRO J1655-40 have shown periodic signals of 67 Hz and 300 Hz, respectively. These frequencies are comparable to the orbital frequencies near the event horizon of the central black holes. I will consider two possible explanations for these signatures: hydrodynamic oscillations from an accretion disk orbiting about the central black hole and `Lense-Thirring Precession' (i.e. frame dragging) of tilted rings of matter orbiting about the hole. I will present arguments, pro and con, for these propositions. However, as the mass of GRO J1655-40 is well known, if the mechanism for the 300 Hz oscillation can be identified we would have our first measurement of black hole angular momentum.
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